[Release-testers] [4.0.0 Release] Release Candidate 4 has been tagged

[Hans Wennborg via Release-testers]

Dear testers,

4.0.0-rc4 was just tagged from the branch at r297204.

This is very similar to rc3, with additional fixes for PR32142 and PR32153.

Please take it for a quick spin. If nothing new comes up, this is what
the final release will look like.

Thanks,
Hans